|Publication number||US5093162 A|
|Application number||US 07/516,934|
|Publication date||Mar 3, 1992|
|Filing date||Apr 30, 1990|
|Priority date||Apr 30, 1990|
|Publication number||07516934, 516934, US 5093162 A, US 5093162A, US-A-5093162, US5093162 A, US5093162A|
|Inventors||Frank Fenton, Thomas C. Walton, Jeffrey W. Meyer, Nathan A. Lopez|
|Original Assignee||Spalding & Evenflo Companies, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (9), Referenced by (69), Classifications (24), Legal Events (14)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention generally relates to golf club shafts and the manufacturing of such shafts and more particularly to the manufacture of a golf club shaft having a larger than normal outside diameter at the tip end with the shaft being a composite shaft constructed of a plurality of circumferential sections which make up the thickness of the shaft. These sections are comprised of standard modulus carbon-graphite fibers in a matrix and fiberglass fibers in a matrix.
The use of carbon-graphite fibers in a matrix for constructing a composite shaft for various pieces of sporting equipment is well known. Specifically, numerous shafts have been constructed of carbon-graphite reinforced composite material by wrapping lamination of plies of fibers impregnated with uncured epoxy onto a mandrel having the desired shape of the finished product and subsequently cured into that final shape. Normally a plurality of laminations are built up in this manner. Various proposals for location of the fibers relative to the longitudinal axis of the shaft have been proposed and have been manufactured.
As is well known, high modulus carbon-graphite fiber fabrication is much more expensive than standard modulus carbon-graphite and shafts made from carbon-graphite fiber for greater torsional stiffness of necessity are quite expensive.
The present invention provides a shaft having a plurality of circumferential sections which make up the shaft, with only a partial number of the sections comprising standard modulus carbon-graphite fibers in an epoxy resin matrix and the remaining outer portions comprising fiberglass fibers in a matrix. The circumferential sections comprise at least two inner plies of angle carbon-graphite at opposing angles, at least one zero ply of fiberglass, and at least one zero ply of standard modulus carbon-graphite. In order to provide the strength at the hosel for this type of shaft, which is the equivalent of the strength provided by typical regular hosel diameter standard modulus carbon-graphite reinforced composite golf shafts, the tip end of the shaft where it is connected to the hosel of the club head is of a substantially larger diameter than the standard golf club shaft. By using the specific method of the present invention of enlarging the tip outside diameter and laying the oriented standard modulus standard modulus carbon-graphite fibers with the proper proportion of lower-cost fiberglass reinforcement in the outer layers of the laminate, a very good performance shaft results which is suitable for a wide range of players.
The invention will be more clearly understood from the following description, taken together with the drawings.
FIG. 1 is a plan view of the mandrel used in making the club of the present invention;
FIGS. 2-5 are schematic views of the various plies used in constructing the shaft of the present invention;
FIG. 6 is a plan view of a completed club shaft;
FIG. 7 is a schematic representation of an enlarged cross-sectional view taken along the lines 7--7 of FIG. 6;
FIG. 8 is an illustration of a procedure utilized to measure the flexibility of wood shafts;
FIG. 9 is an illustration of apparatus used for analyzing the movement in degrees of a shaft as a result of the application of torque; and
FIG. 10 is a diagramatic illustration of apparatus for measuring shaft frequency in cycles per minute.
In the following discussion, certain components used are referred to by terms used in the art. These terms are defined as follows:
Standard modulus [tensile modulus (30-38) million psi].
T-300 type (tensile modulus 33 million psi).
T-300 is the brand name used for both Amoco (USA) and Toray (Japan) for these company's standard modulus carbon-fiber products.
S-2 Type Fiberglass
Specially formulated fiberglass with higher tensile strength than E type (electrical) fiberglass which is made exclusively by Owens Corning in the United States. Some close copies known as T glass are also available in Japan.
Epoxy Resin Matrix
Amine-cured DGEBPA epoxy. DGEBPA is short for diglycidol ether BisPhenol-A, which is a type of epoxy resin.
Referring to FIG. 1, there is shown steel mandrel 11, which is configured to manufacture the shaft of the present invention. Mandrel 11 includes a butt end having a nearly constant diameter over the length B1, and a tip end having a nearly constant diameter over the length T1. The intermediate section tapers to interconnect the butt end and tip end sections. The mandrel has a geometrical configuration designed to produce the enlarged outside diameter of the tip end discussed below. It is to be understood that steel mandrel 11 is much longer than the final shaft. The composite shaft formed as discussed below is removed from the mandrel and cut to the final desired dimensions.
FIG. 2 illustrates the first plies which are used to provide inner circumferential section 13 of the thickness of the shaft. Inner circumferential section 13 is comprised of inner ply 15 and outer ply 17, each ply forming a trapezoidal-shaped pattern. As can be seen, the axial fiber orientation in plies 15 and 17 are of opposite angular inclination. Thus, inner ply 15 includes fibers in a matrix which are oriented at an angle, preferably of -45°, relative to the longitudinal axis of the mandrel and, thus, the ultimate longitudinal axis of the shaft. Outer ply 17 has fiber orientation which is at an angle, preferably +45°, relative to the longitudinal axis of the mandrel, with the mandrel butt at 0° and tip at 180° for reference. Plies 15 and 17 comprise a plurality of parallel reinforcing fibers in an epoxy matrix material with fibers oriented as shown. Ply 17 is applied on top of ply 15 but is displaced circumferentially from ply 15 by a distance equal to one-half the circumference of mandrel 11.
Plies 15 and 17 are applied to mandrel 11 in a now well known manner. Inner circumferential section 13, comprising plies 15 and 17, is rolled onto the circumference of mandrel 11. In the present invention, plies 15 and 17 are of a width such that they are wound twice about mandrel 11, resulting in four plies at the inner portion of the shaft, with the plies alternating with each other so as to provide torsional stiffness resulting from the two opposed angles of the fibers.
FIG. 3 discloses the triangular tip reinforcing ply 19 and trapezoidal butt reinforcing ply 21. These plies are constructed of standard modulus carbon-graphite reinforcing fibers in a matrix material. As can be seen, the fibers of these plies are parallel to each other and are substantially longitudinal so as to provide a pitch angle of inclination to the longitudinal axis of the mandrel at substantially 0°. These plies are geometrically cut so as to mate with the nearly constant diameter portion of the tip end and the nearly constant diameter portion of the butt end. They are wrapped around the first plies, which have already been mounted on the mandrel.
FIG. 4 discloses a ply having a substantially trapezoidal configuration. Again, the fibers of these plies are longitudinal so as to provide a pitch angle of inclination to the longitudinal axis of the shaft at substantially 0°. The fibers in this ply are preferably standard modulus carbon-graphite.
FIG. 5 describes the last basic two-ply structure of the shaft, also configured in the same manner as the layer of FIG. 4 except this sheet forms two layers rather than one. The use of lower modulus high strength fiberglass reinforcement for this particular ply will be discussed subsequently.
Once all of the plies have been wound on the mandrel, the shaft is polypropylene tape wrapped, cured, removed from the mandrel, and sanded to its final geometric tolerances using conventional techniques. The resultant shaft is shown in FIG. 6. The overall length of this particular shaft is 43 inches, with the butt end having a nearly constant outside diameter of 0.620 inch for a length of nine inches and a tip end having a nearly constant outside diameter of 0.420 inch for a length of six inches.
In the preferred standard shaft, the fibers in FIGS. 2, 3, and 4 numbered 15, 17, 19, 21, and 23 are standard modulus carbon-graphite fibers in an amine-cured DGEBPA-Epoxy matrix material, while the fibers in the outer two layers of the laminated shaft consist of S-2 type fiberglasss in the same epoxy matrix.
If a stiffer beam version of the shaft is desired without altering the torsion stiffness, the carbon graphite can be adjusted in FIGS. 4 and 5 to a higher ratio where fiberglass is displaced by standard modulus carbon-graphite by altering the number of plies or fiber aerial weight of each type depending on the stiffness desired.
Additionally, the club could be constructed so that both of the plies of FIGS. 4 and 5 could be of fiberglass in a DGEBPA-Epoxy matrix material for a very flexible shaft.
In each of the combinations, the shaft still maintains the relatively large tip end where it meets the hosel of the club head and the same degree or torsional stiffness. The outside diameter of the tip end is between 0.40 inch and 0.44 inch and, preferably, is substantially 0.420 inch. The outside diameter of the butt end is between 0.61 inch and 0.63 inch, but may vary under standard practice.
FIG. 7 is an enlarged schematic sectional view of the shaft of FIG. 6 taken along the lines 7--7 and identifying the various layers which comprise the shaft structure. The windings are depicted schematically for purposes of clarity. Obvious butt joints which occur are depicted. It is to be understood that a schematic sectional view taken through the intermediate section of the shaft would not show circumferential layers 19 or 21, which are the tip and butt end reinforcing sections, respectively.
The shaft of the current invention uses unidirectional prepreg of standard modulus carbon-graphite fibers (such as (T-300 brand available from Amoco) and high strength type fiberglass reinforcements (such as S-2 brand available from Owens Corning) described as follows:
(1) Standard modulus carbon-graphite prepreg with about 150 gms/meter2 fiber aerial weight (FAW) impregnated with about 34% epoxy resin content (by weight), which is commercially available.
(2) High strength type S-2 brand fiberglass prepreg with about 190 gms/meter2 fiber aerial weight (FAW) impregnated with about 34% epoxy resin content (by weight), which is commercially available. [Alternatively, E-type fiberglass or other inorganic or organic reinforcements with a similar Young's Modulus could be substituted for the high strength type fiberglass (such as S-2 brand), but the high strength type is preferred for its high tensile strength.]
In order to vary the flexibility (e.g., flex pattern) over the range specified, the standard modulus carbon-graphite fiberglass ratio (by volume) can be adjusted in the layers of FIGS. 4 and 5 to a higher value if a stiffer shaft is required. Inversely, the fiber aerial weight (FAW) of the standard modulus carbon-graphite of FIG. 4 can be reduced while increasing the FAW layer shown in FIG. 5, maintaining the composite at the same volume in order to create a more flexible shaft for a lower swing speed player. High torsional stiffness would also be maintained.
FIG. 8 shows a method of checking shaft deflection. The butt of the shaft is captured between two "V" blocks and the tip extends out 42.8".
A 6.5-pound weight is hung on the shaft 35" from the butt end. After the shaft is under load, the distance that the shaft has deflected down, due to the load, is measured at 42.8" from the top edge of the shaft on the deflection board. This measurement in inches is converted by use of the chart set forth below to a flex number. The flex numbers of the present invention are -1, 0, 1, and 2, which equate to a deflection of 5.35" to 4.55". This is the deflection range of the present invention. It should be noted that the shaft tested comprised the preferred construction discussed above.
______________________________________FLEX RANGE OF ALL WOODS INCHES IN DE- FLECTION FLEX FLEX NO. READ AT______________________________________PRESENT 5.15 to 5.35 -1 42.8"INVENTION 4.95 to 5.15 0FLEX 4.75 to 4.95 -- 1RANGE 4.55 to 4.75 -- 2 4.15 to 4.55 XL 3/4 3.75 to 4.15 L 5/6 3.35 to 3.75 R 7/8 2.95 to 3.35 F 9/10 2.55 to 2.95 S 11/12______________________________________
Listed below are test results for (A) a shaft having layers using standard modulus carbon-graphite fibers in the prepregs of FIGS. 2-4 and S-2 brand, high strength type fiberglass fibers in the two prepreg layers of FIG. 5 with a tip diameter of 0.420"; (B) a shaft made of standard modulus carbon-graphite with a boron tip for reinforcement with a tip diameter of 0.335"; (C) a standard steel shaft with a tip diameter of 0.335"; and (D) a shaft having standard modulus carbon-graphite fibers in the prepreg layers of FIGS. 2, 3, and 5 and S-2 brand, high strength type fiberglass fibers in the prepreg layers of FIG. 4 having a tip diameter of 0.420".
______________________________________SHAFT INCHES OF DEFLECTION FLEX NO.______________________________________(A) 5.18" -1(B) 4.31" 3/4(C) 4.24" 3/4(D) 3.44" 7/8______________________________________
FIG. 9 illustrates a torque analyzing machine testing the preferred shaft of the present invention. In order to measure a shaft equivalent to a shaft having a length of 41.5 inches, the 43" test shaft of FIG. 6 is installed in the torque analyzer with the butt end clamped firmly in butt fixture 40. The shaft tip is inserted 1" into tip fixture 42. The tip fixture has a 1-foot length bar extending out of it horizontally and a 1-pound weight is hung from the bar, thus equalling 1-foot-pound of torque exerted on the tip of the shaft.
The amount of movement in degrees shows how much the shaft is affected by 1-foot-pound of torque applied at the tip (i.e., 1° of torque reading is a very small angular displacement, 12° of torque reading is a large angular displacement).
The results of the test of the preferred embodiment of the present invention showed a torque rating between 2.5° and 4.1°.
FIG. 10 illustrates apparatus used to determine vibration frequency of a golf shaft. Base 51 has a collet clamp 53 mounted at one end and support arms 55 mounted at the other end. Photoelectric sensing means 59 are mounted at the upper ends of arms 55. The butt end of shaft 57 is mounted in clamp 53 so as to extend substantially horizontally so as to pass between the light and photocell. A metal weight 61 of 194.5 grams is secured to the end of shaft 57. Weight 61 is depressed and released and the photoelectric sensing means records the vibration in cycles per minute. This testing apparatus is well known in the industry and readily available.
The shaft having standard modulus carbon-graphite reinforcing fibers in the prepregs of FIGS. 2-4 and S-2 brand fiberglass reinforcement in the outer two layers (FIG. 5) has a vibration frequency of 260 CPM to 275 CPM. A standard stiff steel shaft with a tip diameter of 0.335" has a vibration frequency of 306 CPM. It should be noted that the lower CPM results in a softer shaft flex.
Tests were also conducted which compare shock transmittal up the shaft when a ball is struck. These tests were conducted as follows:
Two identical vibration sensors are placed on the shaft. One is placed longitudinally on the shaft at the tip end, the other at the grip end. The sensors, piezo Kynar strips, have their signals amplified and their voltages monitored by the computer data collection at 20,000 samples per second. The data from these sensors, taken over a period of 0.001 second, detect the shock received at the tip part of the shaft, followed some 0.3 to 5 milliseconds later by the shock reaching the grip part of the shaft.
Three shafts were tested:
(A) a standard steel shaft with a tip diameter of 0.335";
(B) a shaft made of more expensive high modulus type carbon-graphite with a boron tip for reinforcement with a tip diameter of 0.335";
(C) a shaft having layers using standard modulus type carbon-graphite fibers in the prepreg layers of FIGS. 2-4 and S-2 brand fiberglass fibers in the prepreg layers of FIG. 5 with a tip diameter of 0.420".
The measurement of transmitted shock is obtained by measuring the maximum shock vibration amplitude received at the tip divided into the same maximum measurement from the corresponding grip data. Each shaft was hit three times to show repeatability. The following table summarizes the results:
______________________________________ Shock Transmission Ratio Grip/TipHit Shaft (Percentage)______________________________________1 A 931 B 741 C 532 A 912 B 852 C 713 A 903 B 753 C 69______________________________________
As will be obvious from the above results, substantially reduced shock is transmitted up the shaft to the grip in the shaft of the present invention.
The shafts of the present invention are constructed as discussed above and have a tip end of substantially 0.420 inch outside diameter with this diameter extending approximately five to ten inches along the shaft. The tip end may be trimmed to achieve the desired flex. Referring to the preferred embodiment discussed above, the tip end is preferably trimmed so as to have a constant diameter extending six inches from the tip end of the shaft. This construction provides superior vibration dampening (primarily attributable to the fiberglass layers of FIG. 5), which results in a highly playable shaft. Such a shaft has a weight of between 77 and 85 grams.
The shaft is playable and easy to hit for all levels of golfers, as exhibited during live golfer testing with very good golfers, strong swingers, average golfers, smooth-swinging golfers, and older, slower-swinging golfers. All swing speeds and talent levels of live golfers see an increase in distance.
Robotic golfer tests have proven that performance is better than the most popular steel shaft on the market in regard to accuracy at fast and average swing speeds, and the robot shows a substantial gain in carry distance at the slower speeds that average golfers use.
Robotic golf test results of drivers at 130 f.p.s. (89 miles per hour) "average golfer" swing speeds are as follows:
______________________________________ Carry Lateral Distance Dispersion (Yards) Trajectory (Yards)______________________________________Control Shaft (SheelShaft TruTemper Dynamic Gold)Center Hit 187 8.1 -.50Toe Hit 182 7.2 +.50Heel Hit 182 8.1 -3.20 Spread of 3.70Large Tip CompostePreferred Six-InchConstant Tip EndOutside Diameterof 0.42 InchCenter Hit 197 10.6 +2.45Toe Hit 192 10.2 +.90Heel Hit 191 10.3 -.40 Spread of 2.85______________________________________
The length of both shafts was substantially the same.
The range of synthetic thermoplastic and thermosetting polymeric materials which can be used in accordance with this invention as a matrix material, other than the above-described epoxy as well as other thermosetting polymer resins such as vinylester and polyester, is quite broad. Suitable homopolymeric and copolymer materials which may be adapted for use in this invention are as follows:
(1) Vinyl resins formed by the polymerization of vinyl chloride or by the copolymerization of vinyl chloride with vinyl acetate, acrylic esters and vinylidene chloride.
(2) Polyolefins such as polyethylene, polypropylene, polybutylene and copolymers such as polyethylene methylacrylate, polyethylene ethylacrylate, polyethylene vinyl acetate, polyethylene methacrylic or acrylic acid or polypropylene acrylic acid.
(3) Polyurethanes such as are prepared from polyols and diisocyanates or polyisocyanates.
(4) Polyamides such as poly (hexamethylene adipamide) and others prepared from diamines and dibasic acids, as well as those from amino acids such as poly (caprolactam).
(5) Acrylic resins as exemplified by the copolymers of methylmethacrylate, acrylonitrile, styrene, meleic anhydride, etc. and blends of these resins with poly vinyl chloride, elastomers, etc.
(6) Polyphenylene oxide resins, or blends of polyphenylene oxide with high impact polystyrene as sold under the trademark "Noryl" by General electric Company, Pittsfield, Mass.
(7) Thermoplastic polyesters, such as PET, PBT, PETG and elastomers sold under the trademarks "Hytrel" by E. I. DuPont de Nemours & Company of Wilmington, Del., and "Lomod" by General Electric Company, Pittsfield, Mass.
(8) Polycarbonate, including blends or alloys including polycarbonate with ABS, PBT, PET, SMA, PE, PPS, PPO, etc. Blends of polyethylene, polypropylene, polyacetal, nylon, polyesters, cellulose esters, etc.
In the above description shorthand symbols are used to describe certain polymers. The symbols used and their description are as follows:
______________________________________ABS Acrylonitrile butadiene styrenePBT Polybutylene terephthalatePET polyethylene terephthalateSMA Styrene maleic anhydridePE PolyethylenePETG Polyathylene terephthalate/glycol modifiedEPDM Ethyl-propylene-non-conjugated diene terpolymerPVC Polyvinyl chlorideEVA Ethylene vinyl acetatePPS Polyphenylene sulfidePPO Polyphenylene oxide______________________________________
The above list is not meant to be limiting or exhaustive, but merely illustrates the wide range of thermoplastic and thermosetting polymeric materials which may be employed as a matrix in the present invention. Mixtures of the above-described materials may also be used.
It is within the purview of this invention to add to the matrix compositions of this invention compatible materials which do not affect the basic novel characteristics of the composition of this invention. Among such materials are antioxidants, antistatic agents, U.V. inhibitors, and stabilizers.
As can be seen from the discussion above, the subject invention can be used in conjunction with a wide variety of polymeric materials which are suitable for the formation of the composite matrix.
As will now be evident, the shaft of the present invention contains separate layers of standard modulus carbon-graphite fibers in a matrix and fiberglass fibers in a matrix. The characteristics of the shaft may be controlled through selective variations of these layers.
The above description and drawings are illustrative only since variations in fiber size and density could be used without departing from the invention, which is to be limited only by the scope of the following claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US3313541 *||Oct 11, 1963||Apr 11, 1967||Us Fiberglass Company||Golf club including reinforced fiber glass shaft|
|US3998458 *||Jul 10, 1975||Dec 21, 1976||Hitachi Chemical Company, Ltd.||Golf club shaft|
|US4023801 *||Sep 24, 1974||May 17, 1977||Exxon Research And Engineering Company||Golf shaft and method of making same|
|US4097626 *||Jun 7, 1976||Jun 27, 1978||Grafalloy Corporation||Construction for a fiber reinforced shaft|
|US4132579 *||Feb 22, 1977||Jan 2, 1979||Exxon Research & Engineering Co.||Golf shaft and method of making same|
|US4319750 *||Apr 30, 1979||Mar 16, 1982||Aldila, Inc.||Golf shaft having controlled flex zone|
|US4455022 *||Nov 9, 1981||Jun 19, 1984||Don Wright Golf Company||Master shaft and method of making golf club shafts therefrom|
|US4757997 *||Aug 12, 1986||Jul 19, 1988||Fiber-Speed International, Inc.||Golf club shaft and method of manufacture|
|GB1261541A *||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5156396 *||Oct 11, 1991||Oct 20, 1992||Somar Corporation||Golf club shaft|
|US5261669 *||Mar 8, 1993||Nov 16, 1993||Kochevar Rudolph J||Weighted golf club and method of making the same|
|US5326099 *||Dec 23, 1992||Jul 5, 1994||The Yokohama Rubber Co., Ltd.||Golf club|
|US5379641 *||Jun 7, 1993||Jan 10, 1995||Exel Oy||Method for measuring the deflection in the shaft of a golf club for controlling the dynamic loft angle of a club|
|US5427373 *||Jun 23, 1993||Jun 27, 1995||Daiwa Golf Co., Ltd.||Shaft for golf club|
|US5505446 *||Dec 8, 1994||Apr 9, 1996||Whitaker; William T.||Variable flex shaft system for an array of golf clubs|
|US5547189 *||Jul 20, 1994||Aug 20, 1996||Billings; David P.||Golf club and club shaft constructions|
|US5556345 *||Aug 7, 1995||Sep 17, 1996||Whitesell; Richard F.||Golf club with improved shafts|
|US5568922 *||May 25, 1994||Oct 29, 1996||Ppct Management Systems, Inc.||Composite telescoping baton|
|US5569099 *||Dec 30, 1994||Oct 29, 1996||Jackson; Al||Golf club shaft and laminar structural element and method for its manufacture|
|US5573467 *||May 9, 1995||Nov 12, 1996||Acushnet Company||Golf club and set of golf clubs|
|US5624519 *||Feb 7, 1994||Apr 29, 1997||Trek Bicycle, Corp.||Method making a composite bicycle frame using composite lugs|
|US5629062 *||Jan 3, 1996||May 13, 1997||Petoca, Ltd.||Fiber reinforced plastic pipe and process for producing the same|
|US5632692 *||Sep 28, 1995||May 27, 1997||Lebovici; Victor B.||Golf club with non-circular shaft|
|US5683279 *||Nov 16, 1995||Nov 4, 1997||Dacor Corporation||Multi-part diving fin|
|US5690879 *||Jul 25, 1995||Nov 25, 1997||Solid Golf, Inc.||Method for injection molding a golf club body|
|US5720671 *||Sep 5, 1996||Feb 24, 1998||Harrison Sports, Inc.||Composite golf club shaft and method of making the same|
|US5788585 *||Sep 6, 1996||Aug 4, 1998||Jackson; Al||Composite golf club shaft and method for its manufacture|
|US5924936 *||Oct 15, 1997||Jul 20, 1999||Penley Sports, L.L.C.||Individually matched set of club shafts and a method for manufacturing an individually matched set of club shafts|
|US5935017||Jun 28, 1996||Aug 10, 1999||Cobra Golf Incorporated||Golf club shaft|
|US5947836 *||Aug 26, 1997||Sep 7, 1999||Callaway Golf Company||Integral molded grip and shaft|
|US5971865 *||Jan 16, 1998||Oct 26, 1999||Wilson Sporting Goods Co.||Golf club with oversize shaft|
|US6117021||Dec 24, 1997||Sep 12, 2000||Cobra Golf, Incorporated||Golf club shaft|
|US6135897 *||Nov 6, 1998||Oct 24, 2000||Penley Sports, Llc||Flexible tip for golf club shaft|
|US6273830 *||Aug 27, 1999||Aug 14, 2001||Nippon Mitsubishi Oil Corporation||Tapered hollow shaft|
|US6302805||Nov 22, 1999||Oct 16, 2001||Penley Sports, Llc||Golf club shaft with improved performance characteristics|
|US6306047 *||Jun 25, 1998||Oct 23, 2001||Daiwa Seiko, Inc.||Golf club shaft|
|US6309309||May 9, 1997||Oct 30, 2001||Taylor Made Golf Company, Inc||Oversized iron-type golf club|
|US6340509||May 29, 1997||Jan 22, 2002||Radius Engineering, Inc.||Composite bicycle frame and method of construction thereof|
|US6352482 *||Aug 31, 2000||Mar 5, 2002||Callaway Golf Company||Golf club with hosel liner|
|US6352662||Aug 23, 1999||Mar 5, 2002||Callaway Golf Company||Integral molded grip and shaft|
|US6354957 *||Mar 26, 1998||Mar 12, 2002||Daiwa Seiko, Inc.||Golf club shaft|
|US6461260||May 15, 2000||Oct 8, 2002||Worth, Inc.||Composite wrap bat|
|US6524195 *||Aug 12, 1999||Feb 25, 2003||Daiwa Seiko, Inc.||Tubular body|
|US6540623||Feb 28, 2001||Apr 1, 2003||Al Jackson||Composite shaft for a golf club|
|US6729970 *||Aug 27, 2002||May 4, 2004||True Temper Sports, Inc.||Hybrid golf club shaft set|
|US6761653||May 13, 2002||Jul 13, 2004||Worth, Llc||Composite wrap bat with alternative designs|
|US6824636||Jul 19, 2002||Nov 30, 2004||Radius Engineering, Inc.||Method of manufacturing a composite golf club head|
|US6866593||Jun 23, 2000||Mar 15, 2005||Harrison Sports, Inc.||Golf club shaft having multiple metal fiber layers|
|US6869372||Aug 30, 2002||Mar 22, 2005||Worth, Llc||Composite wrap bat|
|US6908401||Feb 28, 2001||Jun 21, 2005||Michael H. L. Cheng||Shaft for use in golf clubs and other shaft-based instruments and method of making the same|
|US6926617 *||Mar 14, 2003||Aug 9, 2005||Sri Sports Limited||Golf club shaft|
|US7077761 *||Aug 22, 2003||Jul 18, 2006||Sri Sports Limited||Golf club and method of making golf club|
|US7115045||Aug 22, 2003||Oct 3, 2006||True Temper Sports, Inc.||Hybrid gold club shaft set|
|US7497786||Nov 22, 2005||Mar 3, 2009||Harrison Sports, Inc.||Golf club shaft having multiple metal fiber layers|
|US7704429 *||Nov 13, 2006||Apr 27, 2010||Messier-Dowty Sa||Method of fabricating a composite material connecting rod|
|US8066583 *||Nov 29, 2011||Acushnet Company||Golf club shaft with high balance point and golf club including same|
|US8282503||Jun 29, 2011||Oct 9, 2012||Karsten Manufacturing Corporation||Multiple flex shaft method and system for golf clubs|
|US8292755 *||Feb 24, 2009||Oct 23, 2012||Fujikura Rubber Ltd.||Golf club shaft and golf club|
|US8328656||Nov 28, 2011||Dec 11, 2012||Acushnet Company||Golf club shaft with high balance point and golf club including same|
|US8475291||Aug 22, 2012||Jul 2, 2013||Karsten Manufacturing Corporation||Multiple flex shaft method and system for golf clubs|
|US8491408 *||Sep 22, 2010||Jul 23, 2013||Taylor Made Golf Company, Inc.||Golf club shaft|
|US8678945||Dec 11, 2012||Mar 25, 2014||Acushnet Company||Golf club shaft with high balance point and golf club including same|
|US8900067||Jul 11, 2013||Dec 2, 2014||Taylor Made Golf Company, Inc.||Golf club shaft|
|US9093191||Mar 6, 2008||Jul 28, 2015||CTC Global Corp.||Fiber reinforced composite core for an aluminum conductor cable|
|US20040106463 *||Aug 22, 2003||Jun 3, 2004||Graeme Horwood||Hybrid golf club shaft set|
|US20050124441 *||Jun 14, 2004||Jun 9, 2005||Wound Wood Technologies, Llc||Spiral wound laminate wood and method for construction|
|US20050197204 *||Nov 26, 2004||Sep 8, 2005||Cheng Michael H.||Shaft for use in golf clubs and other shaft-based instruments and method of making the same|
|US20060009302 *||Jun 14, 2005||Jan 12, 2006||Sri Sports Ltd.||Golf club|
|US20100234124 *||Feb 24, 2009||Sep 16, 2010||Fujikura Rubber Ltd.||Golf club shaft and golf club|
|US20110081984 *||Sep 22, 2010||Apr 7, 2011||Taylor Made Golf Company, Inc.||Golf club shaft|
|US20130210539 *||Feb 14, 2012||Aug 15, 2013||Peter Baumann||Golf club putter|
|EP0724895A1 *||Nov 23, 1995||Aug 7, 1996||Wilson Sporting Goods Company||Shaft for a golf club, set of golf clubs and method of selecting shafts|
|EP0742034A1 *||May 9, 1996||Nov 13, 1996||Acushnet Company||Large golf club head|
|EP0843582A2 *||Jul 20, 1995||May 27, 1998||David P. Billings||Golf club and club shaft constructions|
|WO1997018014A1 *||Nov 15, 1996||May 22, 1997||Dacor Corp||Multi-part diving fin|
|WO1997048457A1 *||Jun 18, 1997||Dec 24, 1997||Laurent C Bissonnette||Composite golf club shaft and method of and apparatus for making same|
|WO1998054046A2 *||May 28, 1998||Dec 3, 1998||Radius Eng Inc||Composite bicycle frame and method of construction thereof|
|WO2004020049A1 *||Aug 25, 2003||Mar 11, 2004||True Temper Sports Inc||Hybrid golf club shaft set|
|U.S. Classification||428/34.5, 138/132, 138/130, 156/190, 428/34.7, 428/368, 138/144, 156/188, 473/319|
|International Classification||A63B53/10, A63B59/00, B29C70/30|
|Cooperative Classification||B29L2031/5227, Y10T428/1321, A63B59/0014, Y10T428/292, Y10T428/1314, B29C70/30, A63B59/0074, A63B53/10, A63B2209/02|
|European Classification||A63B59/00M, A63B53/10, B29C70/30|
|Jul 12, 1990||AS||Assignment|
Owner name: ALDILA, INC., A CORP. OF CA, CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:FENTON, FRANK;WALTON, THOMAS C.;MEYER, JEFFREY W.;AND OTHERS;REEL/FRAME:005366/0964
Effective date: 19900619
Owner name: SPALDING & EVENFLO COMPANIES, INC., A CORP. OF DE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:FENTON, FRANK;WALTON, THOMAS C.;MEYER, JEFFREY W.;AND OTHERS;REEL/FRAME:005366/0964
Effective date: 19900619
|Oct 1, 1991||AS||Assignment|
Owner name: LISCO, INC. A CORP. OF DELAWARE, FLORIDA
Free format text: SECURITY INTEREST;ASSIGNOR:SPALDING & EVENFLO COMPANIES, INC. A CORP. OF DELAWARE;REEL/FRAME:005891/0200
Effective date: 19911001
|Oct 9, 1991||AS||Assignment|
Owner name: CITICORP NORTH AMERICA, INC.
Free format text: LICENSE;ASSIGNOR:LISCO, INC., A CORP. OF DE;REEL/FRAME:005870/0184
Effective date: 19910930
|Nov 3, 1994||AS||Assignment|
Owner name: SPALDING & EVENFLO COMPANIES, INC., FLORIDA
Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:CITICORP NORTH AMERICA, INC.;REEL/FRAME:007188/0945
Effective date: 19921202
|Aug 2, 1995||FPAY||Fee payment|
Year of fee payment: 4
|May 20, 1998||AS||Assignment|
Owner name: BANK OF AMERICA NATIONAL TRUST & SAVINGS ASSOCIATI
Free format text: SECURITY AGREEMENT;ASSIGNORS:EVENFLO & SPALDING HOLDINGS CORPORATION;SPALDING & EVENFLO COMPANIES, INC.;EVENFLO COMPANY, INC.;AND OTHERS;REEL/FRAME:009342/0379
Effective date: 19980330
|May 22, 1998||AS||Assignment|
Owner name: BANK OF AMERICA NATIONAL TRUST & SAVINGS ASSOCIATI
Free format text: SECURITY INTEREST;ASSIGNORS:EVENFLO & SPALDING HOLDINGS CORPORATION;SPALDING & EVENFLO COMPANIES, INC.;EVENFLO COMPANY, INC.;AND OTHERS;REEL/FRAME:009227/0574
Effective date: 19980331
Owner name: BANK OF AMERICA NATIONAL TRUST & SAVINGS ASSOCIATI
Free format text: SECURITY AGREEMENT;ASSIGNORS:EVENFLO & SPALDING HOLDINGS CORPORATION;SPALDING & EVENFLO COMPANIES, INC.;EVENFLO COMPANY, INC.;AND OTHERS;REEL/FRAME:009516/0369
Effective date: 19980330
|Jul 23, 1999||AS||Assignment|
Owner name: SPALDING SPORTS WORLDWIDE, INC., MASSACHUSETTS
Free format text: MERGER;ASSIGNOR:LISCO, INC.;REEL/FRAME:010121/0025
Effective date: 19980930
|Aug 26, 1999||FPAY||Fee payment|
Year of fee payment: 8
|Jun 2, 2003||AS||Assignment|
Owner name: TOP-FLITE GOLF COMPANY, THE, A DELAWARE CORPORATIO
Free format text: CHANGE OF NAME;ASSIGNOR:SPALDING SPORTS WORLDWIDE, INC., A DELAWARE CORPORATION;REEL/FRAME:013712/0219
Effective date: 20030528
|Aug 25, 2003||FPAY||Fee payment|
Year of fee payment: 12
|Sep 26, 2003||AS||Assignment|
|Oct 23, 2012||AS||Assignment|
Owner name: MILFAM I, L.P., FLORIDA
Free format text: SECURITY AGREEMENT;ASSIGNOR:ALDILA, INC.;REEL/FRAME:029175/0001
Effective date: 20121022
|Nov 7, 2012||AS||Assignment|
Owner name: WELLS FARGO BANK, NATIONAL ASSOCIATION, CALIFORNIA
Free format text: SECURITY AGREEMENT;ASSIGNOR:ALDILA GOLF CORP.;REEL/FRAME:029258/0208
Effective date: 20120608